\setbeamertemplate{background}{
  \begin{tikzpicture}
  \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
  \fill[color=BGgrey03] (0,0) rectangle(\the\paperwidth,\the\paperheight);
  \fill[color=primaryD] (0,\the\paperheight) rectangle(\the\paperwidth,0.9\paperheight);
  \ifx\insertframetitle\@empty
      \ifnum\thepage>1\relax%
       \fill[color=BGgrey03] (0,0) rectangle(\the\paperwidth,\the\paperheight);
       \fi
   \fi
  \end{tikzpicture}
}

% Title page
\defbeamertemplate*{title page}{material}[1][]
{ 
  \makebox[\linewidth][c]{%
  \begin{minipage}[t][\paperheight]{\paperwidth}
    \raggedright
    \begin{tcolorbox}[colback=primary, enhanced, sharpish corners=all, boxrule=0mm, coltext=textPrimary,
                      fuzzy shadow={0mm}{-0.6mm}{0mm}{0.2mm}{shadow!40!BGgrey03}, % bottomSmall
                      fuzzy shadow={0mm}{-0.2mm}{0mm}{0.2mm}{shadow!20!BGgrey03}, % bottomBig
                      fuzzy shadow={0mm}{ 0.6mm}{0mm}{0.2mm}{shadow!40!primary}, % topSmall
                      fuzzy shadow={0mm}{ 0.2mm}{0mm}{0.2mm}{shadow!20!primary}, % topBig
                      width=\paperwidth, height=0.6\paperheight, flushright upper, valign=bottom, boxsep=0.5cm]
      {\usebeamerfont{title} \inserttitle}\\
      \ifx\insertsubtitle\@empty\relax\else
        {\usebeamerfont{subtitle} \insertsubtitle}\\
      \fi
      % {\usebeamerfont{author}\insertauthor}\\
      % {\usebeamerfont{author}\insertdate}
    \end{tcolorbox}
    
    \begin{tcolorbox}[arc=7.5mm,width=15mm,height=15mm, enhanced, %
                  colback=accent, coltext=textAccent, %
                  fuzzy shadow={0mm}{ 0.9mm}{ 0.6mm}{0.2mm}{shadow!20!primary}, % top
                  fuzzy shadow={0mm}{-0.6mm}{-0.1mm}{0.2mm}{shadow!40!BGgrey03}, % bottomSmall
                  fuzzy shadow={0mm}{-0.2mm}{-0.2mm}{0.2mm}{shadow!20!BGgrey03}, % bottomBig
                  left=.5mm, right=.5mm, top=.5mm, bottom=.5mm, boxsep=0mm, %
                  boxrule=0mm, enlarge left by=10mm, enlarge top by=-10mm]%
                  \includegraphics[width=14mm]{\MaterialIcon}
    \end{tcolorbox}
	\begin{center}
		\vspace*{-10mm}
		{\usebeamerfont{author}\insertauthor}\\
		{\usebeamerfont{author}\insertinstitute}\\
		{\usebeamerfont{author}\insertdate}
	\end{center}
  \end{minipage}%
  }%
  \vfill
}

% Items
\setbeamertemplate{enumerate items}[circle]
\setbeamertemplate{itemize items}{\Large $\bullet$}
\setbeamertemplate{sections/subsections in toc}[circle]

\mode
<all>
